A map of Europe in an atlas will show you all the cities it passes through, including four national capitals.
Oslo, Stockholm, Helsinki, and Copenhagen.
Four
The Danube flows through four capitals: Bratislava, Belgrade, Budapest, and Vienna.
No European river has three capital cities located on it. The Danube has four capitals located on its banks: Belgrade, Serbia , Bratislava, Slovakia , Budapest, Hungary , and Vienna, Austria.
The names of the four main Quad Cities are Bettendorf, Iowa Davenport, Iowa Moline Illinois, and Rock Island, Illinois
Miami, Tampa, Ocala, Pensacola,
Jackson, MS; Lincoln, NE; Madison, WI; Jefferson City, MO
Jerusalem, Hebron, Tiberias and Safed.
The Ottoman Empire had four capitals.
London Japan Paris North pole
The answer you are looking for is the Danube. It actually flows through 4 capital cities: Vienna - Austria Budapest - Hungary Belgrade - Serbia Bratislava - Slovakia